44 lines
1.4 KiB
Plaintext
44 lines
1.4 KiB
Plaintext
// This file is part of www.nand2tetris.org
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// and the book "The Elements of Computing Systems"
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// by Nisan and Schocken, MIT Press.
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// File name: projects/12/Screen.jack
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/**
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* A library of functions for displaying graphics on the screen.
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* The Hack physical screen consists of 512 rows (indexed 0..511, top to bottom)
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* of 256 pixels each (indexed 0..255, left to right). The top left pixel on
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* the screen is indexed (0,0).
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*/
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class Screen {
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/** Initializes the Screen. */
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function void init() {
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}
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/** Erases the entire screen. */
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function void clearScreen() {
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}
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/** Sets the current color, to be used for all subsequent drawXXX commands.
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* Black is represented by true, white by false. */
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function void setColor(boolean b) {
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}
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/** Draws the (x,y) pixel, using the current color. */
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function void drawPixel(int x, int y) {
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}
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/** Draws a line from pixel (x1,y1) to pixel (x2,y2), using the current color. */
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function void drawLine(int x1, int y1, int x2, int y2) {
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}
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/** Draws a filled rectangle whose top left corner is (x1, y1)
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* and bottom right corner is (x2,y2), using the current color. */
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function void drawRectangle(int x1, int y1, int x2, int y2) {
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}
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/** Draws a filled circle of radius r<=181 around (x,y), using the current color. */
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function void drawCircle(int x, int y, int r) {
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}
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}
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